How to fix leaks in a corrugated metal roof

Corrugated metal roofs are recognised for their durability, lightweight strength and weather resistance. They consist of rippled metal sheets for even weight distribution and lighter stress on underlying structural components. Although repairs are rare, corrugated roofs can develop leaks from extreme storm damages, metal expansion or contraction, rust and other sources. Leaks are common around roof joints and seams. Promptly fix corrugated metal to prevent water seepage from damaging home interiors. Fortunately, basic roofing supplies can effectively patch and repair leaks in corrugated metal roofs.

Skill level:

Moderately Easy

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Things you need

Nylon scrub brush

Flexible putty knife

Wire brush

Hammer

Clean rag

White spirit

Paper towels

Metal primer

Urethane roof cement

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Instructions

1

Scrub the damaged area with a nylon scrub brush to remove dirt, moss and grime. Scrape off stubborn grime and debris with a flexible putty knife.

2

Inspect the damaged metal for corrosion and loose nails. Scrub corrosion with a wire brush until the crusty flakes are completely removed. Pull loose nails and hammer them back in place.

3

Dampen a clean rag with white spirit. Wipe the damp rag over the metal to remove loose debris particles and provide a clean surface.

4

Dry the metal with paper towels. Make sure the metal surface is completely clean before proceeding.

5

Spray a coat of metal primer over the damaged area to protect the metal from corrosion. Apply the primer according to the manufacturer's directions. Allow the primer to dry for the recommended amount of time.

6

Spread a smooth coat of urethane roof cement over the damaged metal using the putty knife. Read the cement manufacturer's directions on the product's label for proper application. Allow the roof cement to dry for the recommended amount of time.

Tips and warnings

You can substitute a self-stick waterproof flashing membrane for the urethane roof cement. Apply the flashing membrane according to the manufacturer's directions.

Do not attempt roof repairs during wet, windy, icy or dangerous weather conditions; it is unsafe.

Use roofing materials recommended by your roofing manufacturer to prevent further damaging the metal or voiding the roof's warranty.